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Fix timer code for ARM systems: make sure that udelay() does not

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reset timers so it's save to use udelay() in timeout code.
This commit is contained in:
wdenk 2005-04-04 12:08:28 +00:00
parent 50712ba16e
commit 101e8dfa2a
14 changed files with 140 additions and 80 deletions
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3
CHANGELOG
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@ -2,6 +2,9 @@
Changes for U-Boot 1.1.3:
======================================================================
* Fix timer code for ARM systems: make sure that udelay() does not
reset timers so it's save to use udelay() in timeout code.
* Patch by Mathias Küster, 23 Nov 2004:
add udelay support for the mcf5282 cpu

11
cpu/arm1136/interrupts.c
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@ -254,6 +254,8 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
@ -263,9 +265,12 @@ void udelay_masked (unsigned long usec)
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
reset_timer_masked (); /* set "advancing" timestamp to 0, set lastinc vaule */
while (get_timer_masked () < tmo) /* wait for time stamp to overtake tick number.*/
/* NOP */;
endtime = get_timer_masked () + tmo;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*

15
cpu/arm720t/interrupts.c
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@ -358,15 +358,24 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) {
tmo = usec / 1000;
tmo *= CFG_HZ;
tmo /= 1000;
} else {
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
reset_timer_masked ();
endtime = get_timer_masked () + tmo;
while (get_timer_masked () < tmo)
/*NOP*/;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
#elif defined(CONFIG_S3C4510B)

9
cpu/arm920t/imx/interrupts.c
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@ -81,10 +81,13 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong start = get_timer_masked();
ulong endtime = get_timer_masked() + usec;
signed long diff;
while (get_timer_masked () - start < usec )
/*NOP*/;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
void udelay (unsigned long usec)

15
cpu/arm920t/s3c24x0/interrupts.c
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@ -137,15 +137,24 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) {
tmo = usec / 1000;
tmo *= (timer_load_val * 100);
tmo /= 1000;
} else {
tmo = usec * (timer_load_val * 100);
tmo /= (1000*1000);
}
reset_timer_masked ();
endtime = get_timer_masked () + tmo;
while (get_timer_masked () < tmo)
/*NOP*/;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*

10
cpu/arm925t/interrupts.c
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@ -275,6 +275,8 @@ void udelay_masked (unsigned long usec)
#else
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
@ -285,10 +287,12 @@ void udelay_masked (unsigned long usec)
tmo /= (1000*1000);
}
reset_timer_masked (); /* set "advancing" timestamp to 0, set lastdec vaule */
endtime = get_timer_masked () + tmo;
while (get_timer_masked () < tmo) /* wait for time stamp to overtake tick number.*/
/*NOP*/;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
#endif
}

10
cpu/arm926ejs/interrupts.c
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@ -292,6 +292,8 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
@ -302,10 +304,12 @@ void udelay_masked (unsigned long usec)
tmo /= (1000*1000);
}
reset_timer_masked (); /* set "advancing" timestamp to 0, set lastdec vaule */
endtime = get_timer_masked () + tmo;
while (get_timer_masked () < tmo) /* wait for time stamp to overtake tick number.*/
/*NOP*/;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*

15
cpu/at91rm9200/interrupts.c
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@ -231,20 +231,19 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
#if 0 /* doesn't work for usec < 1000 */
tmo = usec / 1000;
tmo *= CFG_HZ_CLOCK;
#else
tmo = CFG_HZ_CLOCK / 1000;
tmo *= usec;
#endif
tmo /= 1000;
reset_timer_masked ();
endtime = get_timer_raw () + tmo;
while (get_timer_raw () < tmo)
/*NOP*/;
do {
ulong now = get_timer_raw ();
diff = endtime - now;
} while (diff >= 0);
}
/*

6
cpu/at91rm9200/start.S
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@ -117,11 +117,11 @@ reset:
#ifdef CONFIG_INIT_CRITICAL
/* scratch stack */
ldr r1, =0x00204000
/**** ldr r1, =0x00204000 ****/
/* Insure word alignment */
bic r1, r1, #3
/**** bic r1, r1, #3 ****/
/* Init stack SYS */
mov sp, r1
/**** mov sp, r1 ****/
/*
* This does a lot more than just set up the memory, which
* is why it's called lowlevelinit

16
cpu/lh7a40x/interrupts.c
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@ -281,25 +281,29 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
/* normalize */
if (usec >= 1000) {
tmo = usec / 1000;
tmo *= CFG_HZ;
tmo /= 1000;
}
else {
} else {
if (usec > 1) {
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
else
} else {
tmo = 1;
}
}
reset_timer_masked ();
endtime = get_timer_masked () + tmo;
while (get_timer_masked () < tmo);
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*

10
cpu/pxa/interrupts.c
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@ -190,6 +190,8 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) {
tmo = usec / 1000;
@ -200,10 +202,12 @@ void udelay_masked (unsigned long usec)
tmo /= (1000*1000);
}
reset_timer_masked ();
endtime = get_timer_masked () + tmo;
while (tmo >= get_timer_masked ())
/*NOP*/;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*

21
cpu/s3c44b0/interrupts.c
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@ -219,15 +219,22 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) {
tmo = usec / 1000;
tmo *= CFG_HZ;
tmo /= 8;
tmo += get_timer (0);
reset_timer_masked ();
while (get_timer_masked () < tmo)
/*NOP*/;
} else {
tmo = usec * CFG_HZ;
tmo /= (1000*8);
}
endtime = get_timer(0) + tmo;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}

15
cpu/sa1100/interrupts.c
View File

@ -206,15 +206,24 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) {
tmo = usec / 1000;
tmo *= CFG_HZ;
tmo /= 1000;
} else {
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
reset_timer_masked ();
endtime = get_timer_masked () + tmo;
while (tmo >= get_timer_masked ())
/*NOP*/;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*

4
include/configs/cmc_pu2.h
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@ -33,7 +33,7 @@
/* ARM asynchronous clock */
#define AT91C_MAIN_CLOCK 207360000 /* from 18.432 MHz crystal (18432000 / 4 * 45) */
#define AT91C_MASTER_CLOCK 69120000 /* peripheral clock (AT91C_MASTER_CLOCK / 3) */
#define AT91C_MASTER_CLOCK (AT91C_MAIN_CLOCK/3) /* peripheral clock */
#define AT91_SLOW_CLOCK 32768 /* slow clock */
@ -203,7 +203,7 @@ struct bd_info_ext {
#endif /* __ASSEMBLY__ */
#define CFG_HZ 1000
#define CFG_HZ_CLOCK AT91C_MASTER_CLOCK/2 /* AT91C_TC0_CMR is implicitly set to */
#define CFG_HZ_CLOCK (AT91C_MASTER_CLOCK/2) /* AT91C_TC0_CMR is implicitly set to */
/* AT91C_TC_TIMER_DIV1_CLOCK */
#define CONFIG_STACKSIZE (32*1024) /* regular stack */